Study On Preparation And Properties With High-speed Rail Vehicle Pantograph Slide Plate Composite

The research topic of this paper is the preparation of high-speed rail vehicle pantograph slide plate composites and to study its performance. In recent years, the construction of high-speed railway in our country has made remarkable achievement, the normal speed has reached 300 km/h, it brings very stringent requirements to pantograph slide plate composites, such as good electrical conductivity, high stress and fine tribological properties. In the study selected copper as matrix because of it good electrical conductivity, selected CF(carbon fiber) as reinforcement, used G(graphite) and MoS2 improve the tribological properties of pantograph slide plate composites. Apply mechanical alloying technology, carbon fiber surface alloying technology and powder metallurgy method made CF-G/Cu composite samples with different carbon fiber contents (0wt%, 5wt%, 10wt%) and MoS2-CF-G/Cu composite samples with different MoS2 contents (0wt%,2wt%,5wt%,8wt%). With different composition ratio of composite structure, physical properties and tribological properties of samples for the study of the system. The experimental results showed that:Ⅰ. The compactness of CF-G/Cu composites increases with the increase of carbon fiber content. The CF mass fraction of 10% CF-G/Cu sample happened serious slant phenomenon. When the content of CF increased from 0 wt% to 10 wt%, the hardness of CF-G/Cu composites increased gradually, electrical conductivity increase gradually, tribological properties also increased. By the comparison and analysis to the properties of CF-G/Cu composites with different content of CF, we find that the optimal content of CF is 5wt%.Ⅱ. The composites MoS2-CF-G/Cu whose content of MoS2 below 8%, their grain size are smaller and structure are more compact than the sample 8%MoS2-CF-G/Cu. When the content of MoS2 increased from 0 wt% to 8 wt%, the hardness of MoS2-CF-G/Cu composites increased gradually, electrical conductivity decreased gradually, compactness also decreased. MoS2 can not be added by the way of mechanical alloying, MoS2 can react with copper matrix partly, the residual MoS2 makes for improve the tribological properties of MoS2-CF-G/Cu composites. By the comparison and analysis to the properties of MoS2-CF-G/Cu composites with different content of MoS2, we find that the optimal content of MoS2 is 5wt%.